English verb conjugation
COULD OPINE

Regular verb: opine - opined - opined

Affirmation

Simple form	V-ing form
I could opine you could opine he could opine we could opine you could opine they could opine	I could be opining you could be opining he could be opining we could be opining you could be opining they could be opining
Perfect	V-ing perfect
I could have opined you could have opined he could have opined we could have opined you could have opined they could have opined	I could have been opining you could have been opining he could have been opining we could have been opining you could have been opining they could have been opining

Negation

Simple form	V-ing form
I could not opine you could not opine he could not opine we could not opine you could not opine they could not opine	I could not be opining you could not be opining he could not be opining we could not be opining you could not be opining they could not be opining
Perfect	V-ing perfect
I could not have opined you could not have opined he could not have opined we could not have opined you could not have opined they could not have opined	I could not have been opining you could not have been opining he could not have been opining we could not have been opining you could not have been opining they could not have been opining

Interrogative form

Simple form	V-ing form
could I opine? could you opine? could he opine? could we opine? could you opine? could they opine?	could I be opining? could you be opining? could he be opining? could we be opining? could you be opining? could they be opining?
Perfect	V-ing perfect
could I have opined? could you have opined? could he have opined? could we have opined? could you have opined? could they have opined?	could I have been opining? could you have been opining? could he have been opining? could we have been opining? could you have been opining? could they have been opining?

Interro-negative form

Simple form	V-ing form
could I not opine? could you not opine? could he not opine? could we not opine? could you not opine? could they not opine?	could I not be opining? could you not be opining? could he not be opining? could we not be opining? could you not be opining? could they not be opining?
Perfect	V-ing perfect
could I not have opined? could you not have opined? could he not have opined? could we not have opined? could you not have opined? could they not have opined?	could I not have been opining? could you not have been opining? could he not have been opining? could we not have been opining? could you not have been opining? could they not have been opining?